Larry Weinman wrote in post #18537028It is my understanding that the 70-200 f2.8 ll is the only series ll lens that does not benefit by the chip in the Canon 2X lll teleconverter. I tried the 2X lll on my 70-200 f2.8 ll and it is a dog as far as AF speed and the AF gets easily confused when focusing near the minimum focus. I have the 100-400ll and that focuses quickly even when the 1.4 is attached.

Fascinating. The 70-200mm II is one lens I have not had a chance to try the MkIII.

100-400mm MkII.When using 5D4 for example, the difference between MkII and MkIII T-cons is substantial in the AF dept. None of Canon's previously imposed mandatory AF slow down "for focus precision" and all points active @ F/8.

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